Unlock the Secrets: Causes of Hair Loss Unveiled | Expert Advice

Causes of hair loss

Hair loss can be a distressing and confidence-shattering experience for both men and women. Understanding the various causes is the first step to preventing and treating this condition. This comprehensive guide unveils the key factors behind hair loss and provides expert advice for maintaining a healthy head of hair.


Hair loss is incredibly common, affecting around 50 million men and 30 million women in the United States alone. However, the causes are often complex and multi-factorial. Genetics, hormones, nutrition, medications and diseases can all trigger or exacerbate hair loss. The emotional impact can also be significant, harming self-esteem and causing anxiety or depression.

This article will explore the most significant contributors to hair loss and alopecia so you can identify risk factors and take proactive steps for prevention and management. Hair growth is a cyclical process, so intervention at the right time can make a real difference.

Genetic Factors

Genetics play a major role in hair loss for both sexes. Familial predisposition is responsible for the majority of hair loss cases.

Androgenetic Alopecia

This hereditary condition, also called male or female pattern baldness, accounts for over 95% of hair loss. It is linked to dihydrotestosterone (DHT), a metabolite of the male sex hormone testosterone. Hair follicles sensitive to DHT shrink, shortening the growth phase.

  • In men, it manifests as receding hairline and bald spots. About 50% of Caucasian men have some degree of male pattern baldness by age 50.
  • In women, it causes diffuse thinning over the top and crown of the head. About 50% of women experience female pattern hair loss by age 80.

Other Hereditary Conditions

  • Telogen effluvium – temporary shedding caused by trauma, stress, or other triggers. More prevalent in women.
  • Congenital triangular alopecia – Triangle-shaped bald patch present from birth.
  • Alopecia areata – Autoimmune disorder causing patchy hair loss. Genetic factors increase susceptibility.

Hormonal Imbalances

Hormones have a major regulatory role in the human body and hair growth is no exception. Fluctuating hormone levels or dysfunctional endocrine glands can disrupt the normal hair growth cycle.

Thyroid Disorders

Both hypothyroidism and hyperthyroidism can trigger telogen effluvium, as thyroid hormones influence hair follicle cycling. Levothyroxine treatment usually reverses thyroid-related hair loss.

Polycystic Ovarian Syndrome (PCOS)

PCOS leads to elevated androgens like testosterone which bind to scalp hair follicles, stunting growth. Anti-androgen medications like spironolactone can treat PCOS hair loss in women.


Declining estrogen levels cause hair to thin and enter resting phase prematurely. Minoxidil and low-androgen index birth control pills may help counter menopausal hair loss.


Estrogen surges followed by sharp drops after delivery frequently cause telogen effluvium type shedding. However, normal regrowth usually occurs within 6 months postpartum.

Nutritional Deficiencies

A balanced diet provides the essential micronutrients for optimal hair health. Deficiencies can disrupt the hair growth cycle.


Iron enables proper oxygen supply to follicles, stimulating growth. Low levels may cause anemia-related hair loss. Good dietary sources include spinach, lentils, red meat.


Zinc deficiency can lead to telogen effluvium. Oysters, nuts, seeds and legumes are rich zinc sources.


Biotin, also known as vitamin B7, aids keratin production for hair strength. Egg yolks, fish, liver and other biotin-rich foods can prevent deficiency.

A daily multivitamin helps ensure adequate micronutrients for hair health. A balanced diet with sufficient protein is also recommended.

NutrientFood Sources
IronSpinach, red meat, lentils
ZincOysters, nuts, seeds
BiotinEggs, liver, fish
Hair Loss Treatment

Medical Conditions

Certain medical conditions can trigger hair loss by affecting growth cycles. Identifying and managing underlying disorders is key.

Alopecia Areata

This autoimmune disease causes patchy, circular hair loss. It occurs when the immune system attacks hair follicles, halting growth. Controlling flare-ups with medications like corticosteroids may encourage regrowth.

Lichen Planopilaris

This chronic inflammatory skin condition destroys hair follicles, causing scarring alopecia. Oral steroids, anti-inflammatory drugs and immunosuppressants may minimize further damage.


Some lupus patients experience thinning hair or complete alopecia. Immunosuppressants can control inflammation and limit hair loss.

Thyroid Disorders

As discussed earlier under hormonal causes, both hypothyroidism and hyperthyroidism can trigger hair loss.


Various anemia types like iron deficiency anemia cause low oxygen supply to hair follicles, impeding growth.

Cancer Treatment

Chemotherapy targets all rapidly dividing cells, including hair follicles. Hair loss is frequent but reversible once treatment ends. Radiation therapy can also damage follicles.

Medications Causing Hair Loss

Many commonly prescribed drugs and treatments have hair loss as a potential side effect. Patients can consult doctors about alternatives with less risk of alopecia.

  • Blood thinners – Heparin, Coumadin
  • Antidepressants – Prozac, Zoloft
  • Cholesterol medicines – Lipitor
  • Anti-acne drug – Accutane
  • Cancer chemotherapy
  • Hormone replacement therapy
  • Birth control pills
  • Anti-seizure drugs – Dilantin, Tegretol
  • Steroids – Prednisone

Lowering dosages or switching medications if possible can minimize hair loss. Any drastic medication change should be supervised by a healthcare professional.

Stress and Hair Loss

Stress affects hair follicles by triggering telogen effluvium and impeding growth cycles. Hair loss usually occurs 2-3 months after stressful events due to the hair growth cycle time lag.


  • High stress jobs
  • Financial difficulties
  • Grieving loss of loved ones
  • Psychological trauma
  • Major lifestyle changes
  • Chronic stress


To minimize stress-induced hair loss:

  • Practice relaxation techniques – yoga, meditation
  • Get regular exercise
  • Prioritize quality sleep
  • Try counseling or therapy
  • Seek support from loved ones
  • Maintain work-life balance

Age and Hair Loss

Some hair loss as we get older is inevitable. However, the aging process can be slowed with proactive care.

Natural Progression

With aging, hair growth cycles shorten and more follicles enter resting phase. Hair becomes finer, shorter and fewer in number. Genetics dictate the severity.

Tips to Slow Progression

  • Use anti-thinning shampoos
  • Avoid heat styling tools
  • Handle hair gently
  • Consider hair thickening products
  • Maintain healthy diet
  • Take vitamins

Damaging Hair Care Habits

Improper hair care and styling habits strain follicles, weaken strands and cause excessive fallout. Prevention is critical for hair loss prone individuals.

Heat Styling

Frequent use of hot styling tools like blowdryers, straighteners and curling irons dehydrate and burn hair. Allow hair to air dry instead.

Harsh Chemicals

Repeated bleaching, dyeing, perming or relaxing places excessive stress on hair and affects root health.

Tight Hairstyles

Tight braids, cornrows, ponytails, buns and extensions put constant tension on hair roots, causing traction alopecia. Avoid pulling hair too tightly.


Aggressive brushing and combing strains delicate follicles. Use wide-tooth combs gently when hair is wet.

Prevent hair loss

Natural Methods to Treat Hair Loss

Certain home remedies and lifestyle measures may aid hair regrowth and offset thinning. While not definitive cures, they are worth exploring given their safe profiles.

  • Scalp massages to stimulate circulation
  • Aloe vera, coconut or jojoba oil hair masks
  • Balanced, nutritious diet
  • Stress management techniques
  • Biotin and iron supplements
  • Saw palmetto herb for DHT inhibition

Seeking Professional Help

If you notice sudden, patchy or rapid hair loss, seek specialized medical help early for accurate diagnosis and treatment.

  • Tests – Doctors may conduct blood work, scalp biopsy or trichoscopy.
  • Treatment – Minoxidil, finasteride, corticosteroids, androgen blockers, immunomodulators, counseling, hair transplant, laser therapy, PRP injections. Treatment depends on diagnosis.
  • Specialists – Dermatologists, trichologists or hair restoration surgeons can provide effective hair loss treatment plans catered to the individual and their diagnosis.


Hair loss is a complex condition with an array of potential triggers. A multi-pronged approach is required to prevent and treat the various types of alopecia. While genetics are unchangeable, factors like nutrition, hormonal disorders, hair care habits and stress levels can be optimized to support healthy hair growth. Swift diagnosis and early treatment are key. With expert guidance and diligent care, the impact of hair loss can be substantially reduced.


What are the common causes of hair loss?

The most common causes are genetics, hormonal changes, medical conditions, medications, stress, poor nutrition, aging, and damaging hair care practices. Androgenetic alopecia or male/female pattern baldness is the leading cause.

Can stress lead to hair loss?

Yes, stress can trigger telogen effluvium, a temporary shedding condition. High stress causes more hairs than normal to enter the resting phase, leading to excessive hair fall a few months later.

Is genetics a major factor in hair loss?

Genetics play a very large role. Androgenetic alopecia, which causes male and female pattern baldness, is hereditary. Your genes determine how sensitive you are to hair loss triggers.

How can hormonal imbalances contribute to hair loss?

Hormones like testosterone, estrogen and thyroid hormones regulate the hair growth cycle. Any hormonal imbalance like menopause or thyroid disorders can disrupt cycles, potentially causing loss.

Does a poor diet affect hair health?

Yes, nutritional deficiencies in iron, zinc, protein and other nutrients can impact the hair follicles’ ability to regenerate. This leads to thinning, shedding and slowed growth.

Are there medical conditions that cause hair loss?

Some conditions like alopecia areata, scalp infections, lupus, anemia and thyroid disorders can cause hair loss. Illnesses, high fevers, and cancer treatments like chemo also cause temporary shedding.

Can certain medications lead to hair loss?

Yes, many common drugs used for acne, depression, heart conditions etc. list hair loss as a potential side effect. The medications affect the hair growth cycle, leading to excess shedding.

How does age play a role in hair loss?

Some hair loss and thinning as we age is normal due to shortened growth cycles. However, it can be accelerated by age-related conditions like hormonal changes and nutrient absorption issues.

What role does hair care and styling practices play in hair loss?

Harsh chemicals, hot tools, tight styles and aggressive brushing can damage follicles and cause breakage. This trauma can exacerbate genetic or age-related hair loss.

Are there natural remedies to prevent hair loss?

Diet, scalp massage, essential oils, minimizing harsh styling, and stress management may help prevent loss. Saw palmetto and biotin supplements may aid growth. But check with a doctor first.